Grindstone-turning apparatus.



' No. 815,034. PATENTBD MAR. 13, 1906. D PERDEW.

- GRINDSTONB TURNING APPARATUS.

APPLICATION FILED MAR.22, 1905.

. -UNITED STATES PATENT OFFICE.

DOUGLAS PERDEW, F CONSTITUTION, OHIO.

GRlNDSTONE-TURNING PPARATUS.

Specification of Letters Patent.

Patented March 13, 1966.

Application filed March 22, 1905. Serial No. 251.532.

To all whom it may concern/.- l

, Be it known that I, DOUGLAS PERDEW, a resident of Constitution, in the county of Washington and State of Ohio, have invented certain new and useful Improvements in Grindstone-Turning Apparatus; and I do hereby declare the following to be a full,

. clear, and exact description of the invention,

. mechanism for automatica ly feeding the .bits

to the stone as the latter is turned. 7

- With these and other objects in view the invention consists in certain novel features of construction and combinations andarrange- 'ments of parts, as will be morefully herein after described, and pointed out in the claims.

In the accompanying drawings, Figure 1 is a perspective view of a machine embodying my'improvementsand Figs. 2 and 3 are views ofdetails ofconstruction; V I '1 represents a supporting-frame comprisinglongitudinal and cross timbers arranged,

for example, as shown and havingan upright frame 2, supported on the intermediate 1 I bearings 4 on the forward portion of frame 1' cross-timber.

3 represents a drive-shaft supported 1n and carrying tight and loose pulleys 5 and 6 for the adjustment of the driving-belt to.

drive the shaft or turn pulley 6 without driving the same. This shaft 3 is made angular on one end to receive the'stone 7, to beturned and has a slot therein for the reception of a wedge-shaped key 8 tofirmly hold a collar-9 against the stone and compensate for various thicknesses of stone. A sleeve 10,is secured on shaft 3,and is provided at its ends with facing'beveled friction-gears 11 and 12 fora purpose which will hereinafter appear. 7

In bearings 13 on the intermediatecross timberof frame 1 a rod or shaft 14 is mounted, and two eccentrics '15 are mounted to turn on the rod or shaft 14 and, have levers 16 secured thereto to control their movement. These eccentrics are normally prevented from lateral displacement by collars 15 adjustably. secured tothe shaft. Straps or bands 17 are around these eccentrics 15 and have arms 18 secured thereto. These arms '18 are provided at their outer ends with blocks 19, made with lateral and vertical openings to receive cutting-bits 20 and locking keys 21 and are adapted to present the bits 20 to the opposite edges of thestone to grind the same. thereby can be adjusted laterally to accommodate them to the particular stone to be turned by loosening the collars 15 and moving the eccentrics laterally on the shaft 14.

The arms 18 and cutters carried I Lateral strengthening and adjusting bracerods 22 are pivotally connected at one end to the arms 18 near the outer ends of the latter, and the. inner ends of said. brace-rods are made with openings and rest between par- '1 allel flanges 23jon sleeves 24, secured to rod or shaft 14. These flanges 23 are made with a series of alined openings, with any 'pair of which the openings in the ends of rods 22 may be alined to receive securing-pins to hold the rods and brace the arms 18, thus permit-' tingthe outer endsof the arms to be' adjusted laterally, according to the thickness of the stone.

On the upright frame 2 a horizontal shaft 25ismounted in suitable bearings 26, and pinions 27 are mounted on this shaft. Each pinion 27 is made with groove 27 a to receive a key or spline 27 on the shaft, so as to cause said pinions to rotate with the shaft, but to be adjustable thereon, according to the thickness of the stone, and said pinions mesh with racks 28 on the under faces of parallel bars 29, the lower and outer ends of said bars being pivotally secured to the blocks 19 on the outer ends of arms 18. A worm-gear 30 is also secured on shaft 25 and receives motion from a similar gear 31 on a shaft 32. The shaft 32 is supported at one end in a bracket 33, secured to upright frame 2, and near the outer end of the shaft it is hung in a bearing 34 at the lower end of a. lever 35. The lever 35 is pivoted between its ends to a yokebracket 36, secured to frame 1, and theforward end of shaft. 32 carries a beveled friction-gear 37 to engage either of'the frictiongears 11 or 12 or lie idle between them. The upper end of lever 35 is connected by a link 38 with one member of a bell-crank lever 39, mounted on a bracket 40, and the other mem ber of the bell-crank lever 39 isconnected by a rod or li nk 41 with a hand-lever 42;, fulcurmed on the frame 1 This lever 42 is provided with a detent 43, controlled by the op erator and adapted to engage in any of the notches of a segment 44, secured to frame 1, and lock the lever and parts controlled thereby at any adjustment.

The operation of my improvements is as follows: Motion is transmitted to shaft 3 to turn the stone and the gears 11 and 12. The operator then throws lever 12 in one direction, causing the gear 37 to engage one of the gears 11 or 12 and drive-shaft 32 and through the medium of gears 31 and 30 turn shaft 25 and the pinions 27 on the latter, move racks 28 and bars 29 forward, thus feeding the bits 20 downward as the stone is ground. To move the bits upward, the gear 37 is moved into engagement with the other gear 11 or 12, as the case may be, and to hold the bits stationary the lever 42 is moved to a vertical or intermediate position.

The arms 18, carrying the bits, may be adjusted longitudinally to exactly position them by moving levers 16 to turn eccentrics 15, and a greatmany slight changes might be made in the general form and arrangement of the parts described Without departing from my invention, and hence I do not restrict myself to the precise details set forth, but consider myself at liberty to make such slight changes and alterations as fairly fall within the spirit and scope of my invention.

Having fully described my invention, what I claim as new, and desire to secure by Letters Patent, is

1. In a machine of the character described, the combination with means for rotating a stone, of a pivoted arm, a cutter carried by said arm, a longitudinally-movable bar pivotally connected with said arm, and means for moving said bar and permitting its forward end to simultaneously descend with the pivoted arm and cutter.

2. In a machine of the character described, the combination With means for rotating a stone, of a pivoted arm carrying a cutter, a shaft, a pinion on said shaft, and a rack-bar mounted upon said pinion and pivotally attached to the arm carrying the cutter.

3. In a machine of the character described, the combination with a rotary mounting for a stone, of a pivoted arm carrying a cutter for dressing the stone, a shaft, a pinion on the shaft, a rack-bar mounted upon said pinion and pivotally connected with the arm carrying the cutter, and gearing between said rotary mounting and said shaft.

4. In a machine of the character described, the combination with means for rotating a stone, of a pivoted arm, a cutter carried by said arm, means for adjusting said arm longitudinally and means connected with said pivoted arm to move the cutter in contact with the stone.

5. In a machine of the character described, the combination with means for rotating the stone, of two pivoted arms, cutters carried by said arms, longitudinally-movable bars piv otally connected with said arms, and means for driving said bars and permitting their forward ends to simultaneously descend with the pivoted arms and cutters.

I 6. In a machine of the character described, the combination with means for rotating a stone, of two pivoted arms, cutters carried by said arms, means for adjusting said arms longitudinally and means connected with said pivoted arms to move the cutters in contact with the stone.

7. In a machine of the character described, the combination with a shaft constructed to receive a stone to be turned, of two pivotallysupported arms, cutters carried by said arms, rack-bars pivotally connected with said arms, pinions on which said rack-bars are mounted and means for operating said pinions.

8. In a machine of the character described, the combination with a shaft to receive a stone to be turned, and driving means for said shaft, of two pivotally-supported arms, cutters carried by said arms, rack-bars pivotally connected with said arms, pinions upon which said rack-bars are mounted, and means intermediate the driving shaft and. said pinions for operating the latter when the driving-shaft and stone are rotated.

9. In a machine of the character described, the combination with a rotary mounting for a stone to be ground, of bitcarrying devices, longitudinally-movable bars pivotally connected with said devices, racks on said bars, and pinions engaging said racks for feeding the bits to the stone as the latter is ground.

10. In a machine of the character described, the combination with rotary mounting for a stone, of pivoted arms, bits carried by said arms, longitudinally-movable bars connected at one end to said arms, racks on said bars, pinions engaging said racks, and means for turning said pinion controlled by the turning of the stone-mounting.

11. In a machine of the character described, the combination with a shaft, means for securing a stone thereon, and facing beveled friction-gears on said shaft, of pivoted bitearrying arms, bars connected with said arms, racks on said bars, pinions engaging said racks, a friction-gear to drive said pinions, and means for moving said friction-gear into engagement with either of theiirst-mentioned friction-gears according to the direction of movement desired for the bars.

' 12. In a machine of the character described, the combination with rotary mounting for a stone to be ground, of a shaft, eccentrics thereon, straps or bands on said eccentrics, arms socured to said straps or bands and cutter heads or blocks carried by said arms, and levers secured to the eccentrics and adapted to turn them to adjust the arms longitudinally.

13. In a machine of the character described, the combination with a rotary mounting for a stone to be ground,- oflaterallyadjustable pivotallysupported arms, cutters carried thereby, longitudinally movable rack bars the same, loits carried by said arms, lateral brace-rods pivotally secured to the arms at one end,rand. means at the other ends of the brace-rods to adjust the arms laterally.

In testimony whereof I have signed this specification in the presence of two subscribing witnesses.

' DOUGLAS PERDEW. Witnesses:

' O. E. FOSTER,

'HoLMEs SEFFENs. 

